hamilton



QQQQQQQ@ o O O O O o o o. O O D "PETERS, PHOTO-UTNOGRAPHER. WASHINGTON;D. C.

TD SATES PATENT OFFICE.

WM.. G. HAMILTON, OF NEV YORK., N. Y., ASSIGN-OR TO JOHN. C. HAAHLTON,OF SAME PLACE.

BRIDGE-WALL. OF BOILER-FURNACES.

Specicaton of Letters Patent No. 22,530, dated January 4, 1859'.

Fc` llwhom 'it may concern:

Beit known that I, lVrLLIaM Gr. HAMIL- Toi, of New York, in the countyof New York and State of NewV York, have invented certain Improvementsin Bridge-Valls for Steam-Boilers, the construction and operation ofwhich I have described in the following specification and illustrated inits accompanying drawings with sufficient clearn'ess to enable competentand skilful workmen in the` arts toy whichA it pertains or is mostnearly allied' to make and use my invention.

The increasing use of coal ask a fuel in' steam boilers has given riseto various efforts botlr in this country and Europe to devise means forthe more perfect consumption of its smoke, or in other words to producea more perfect combustion in the furnaces of steam boilers than hashitherto been attained. Among these may be mentioned aV temporary brickwall placed in the upper' part of the firey box, in front of the flues,to retain heat and thereby produce a more perfect combustion. of theparticles which rise unconsumed from the fuel. A water bridge has alsobeen placed within the fire box to' economize the heat of the fire andfor the purpose of burning wet tan bark, sawdust, and kindredsubstances, a sort of air bridge has been introduced; All these devicesare more or less` useful in their way; but they do not fully nreet therequirements andi necessities of the case in burning coalv as a fuel insteam boilers, especially uponl railways where it is not only an objecttofeconoinize fuel but also. a very great obj ect to get rid o-f thesmoke, which. would otherwise be a very' uncomfortable annoyance to thetraveling public.

The object of my invention is to produce a bridge wall which while itshall produce a more perfect combustion than any of its predecessors,shall also be so constructed and arranged as to allow access to theparts for repairs.

My said invention then consists in the construction and arrangement ofthe parts hereinafter described by which the bridge wall is made capableof being folded down out of the way when it is necessary to get at thetubes, and also in the mode hereinafter described of hanging saidVbridge wall by which a strong and efficient blast of air through it issecured as hereinafter more fully set forth.

In the accompanying drawingsFigure l is g longitudinal sectional.elevation of a part y of a locomtive boiler with my bridge wallsattached. Fig. 2 is a rear elevation also in section., one half of therearA bridge wall being cut away to show that in front, and

. one half of the front one being omitted to prevent confusion in the'representation of the other. Fig; 3 is a section showing the parts ofthe rear bridge wall that liey on the `-side toward the furnace door ofthe line `X X as drawn across a portion of Fig; 1, at the left hand ofthev same line as drawnA 1 across Fig. 4, and back or toward the top ofAthe page fromr the same line drawn across F ig; 5. Fig. 4 isa sectionalelevation of the same bridge wall cut through from front to back, theview being taken, at` the center of one of the pipes, though the pipe isleft en,-

tire. Fig. is a view of theparts of the rear bridge wall that lie belowthe line Y Y as drawn across Figs.. l, 3 and 4. Fig. 6 is a verticalsectionof the forward bridge wall from front to back, the plane oflsection being taken4 through one of the pipes.V Fig. 7 is a sectionshowing those parts of the forward bridge wall that lie forward, orvtoward the right hand of the page, of the line Z Z as drawn across Figs.l and 6,. and showingalso its connection. through that part ofthe boilerwhich forms the sides of the fire box and somewhat the mode of securingi-t in position.

A is a part of the re box portion of the boiler of a locomotiveengine,constructed in. most respects in the usual way.

B is the crown sheet. This is alsoA made and hung iln the ordinarymanner.

D D is` the grate which is divided near the middle, the rear part being:so hung as to allow it to be lowered at the forward end to allow thefolding down of the rear bridge wall C which is hung'upon an axis at cjust below the grate. rlhis part of the grate is held up in` place byany ordinary catch. The construction of this bridge wall C will betolerably apparent from an inspection of the sectional views, Figs. 3, 4and 5.

4The axis upon which this bridge wall C is hung is formed upon the endof a pipe or tube E, said pipe having a bend in it after it passeswithin the lire box to bring its middle portion into the properposition. This tube E has openings e e to discharge air into the lowerpart of the fire, and also opens into the tubes F which extend up fromit for the two-fold purpose of conveying air from it into the lire, andof supporting the re bricks G which compose the most l exposed part ofthe bridge wall. The tubes F also have openings l7C for the discharge ofair into the tire. The bricks Gr are so made as to allow space aroundthe tubes F, and have also perforations g to allow air to pass into thefire. Said bricks are secured in position by the bolts t it.

The tubes F open at the upperV end into a trunk H which is alsoperforated to allow the air to escape, and has the further provision forthe discharge of air, of being cut sufciently short at the ends to allowspace for discharge between them and the sides of the tire box. Thistrunk H is covered by the perforated plate I which is easily removableto allow the tubes and other parts to be cleaned when necessary. Whenput up ready for use, this bridge wall C terminates at the top in a firebrick grating J, one end j of which is supported by the bridge wall andthe other rests upon a ledge fle attached to the back of the tire boXimmediately above the lower fire door K.

In order to give a circulation of air through the bridge the pipe E ismade holin consequence of this last device, the blast,

it will be obvious, will be increased by an increase of the speed of theengine.

The construction of the forward bridge wall M represents in section inFigs. 6 and 7 is in many respects much the same as that of the bridgewall C, though its form is somewhat different as shown, and it alsodiffers from the other in receiving air at the top as well as at thebottom through the sides of the fire boX by means of slip joints N N bywhich joints it is secured in position, these slip joints termiating inhoods the same as the axis of the bridge wall C and for the samepurpose. This bridge wall M is hung upon these slip oints both at thetop and bottom. As the top and bottom pipes are hung at fixed points itbecomes necessary to provide for the expansion of the connecting pipesby heat, which is done by an expansion joint as shown in Figs. 6 and 7.A very considerable part of the middle portion of the bridge wall M ismade of open fire brick grating m to allow the products of combustion topass. These bridge walls are so constructed and arranged as to greatlyfacilitate the process 0f combustion, not only by supplying air at thepoints where it is needed, but also retaining a very great heat in theupper portion of the fire box which aids very much in the ignition ofthe gases of combustion. Both these bridge walls are so made as to becapable of being turned down upon their lower axis, it only beingnecessary for that purpose to disengage the upper fastenings which holdthem in place, and in the case of the rear bridge wall to re move thebrick grating which rests upon its top.

rlhe mode of fastening the upper end of the forward bridge wall hasalready been described in connection with the drawings. The rear bridgewall is secured in position by the lever O attached to the hoods inwhich the axis terminates, and by the bolt p which passes through thelever O and is tapped into the side of the tire box. In the operation ofletting down these bridge walls, the forward end of the rear portion ofthe grate it first let down, the brick grating on the top of the rearbridge wall is then removed and the upper fastenings of the bridge wallsbeing undone, they may with very great facility, and without injury, belet down into the positions shown in red lines in Fig. l, which beingdone gives abundant opportunity to get at the tubes and crown sheet forrepairs with about the same convenience as if the bridge walls had neverbeen introduced.

The particular improvement which constitutes my said invention, andwhich I claim as having been originally and first invented by me, is-

The hanging of the bridge wall upon an axis in the manner described orequivalent, by which it is made capable of being folded down out of theway as set forth, and also the making of the axis hollow terminatingwith an opening forward, as described and shown, for the purpose stated.

IVM. G. HAMILTON.

VTitnesses It. IVELLS, Trios. l?. I-Iow.

